Improvement in wrenches



M. E. GA'MPFIELD.

Wrench.

No. 166,587. PatentedAug.10,l875.

Fig.1

jizvezziorx MATTHEW E. GAMPFIELD, OF GIRARD, PENNSYLVANIA, .ASSIGNOR TORUSH S. BATTLES, OF SAME PLACE.

IMPROVEMENT IN WRENCHES.

Specification forming part of Letters Patent No. 166,587, dated August10, 1875; application filed April 13, 1875.

To all whom it may concern:

Be it known that I, MATTHEW E. CAMP- FIELD, of the borough of Girard,county of Erie and State of Pennsylvania, have invented certain new anduseful Improvements in Screw-Wrenches; and I do hereby declare thefollowing to be a full, clear, and exact description of the same,reference being had to the accompanying drawings, which form a part ofthis specification.

Figure 1 represents a side view of a screwwrench embracing myimprovements and constructed in accordance with my invention, and Fig. 2represents a longitudinal section of a portion of it.

To enable those skilled in the art to which my invention belongs to makeand use the same, I will describe it more in detail.

The invention is an improvement in theclass of monkey-wrenches whoseferrules (for supporting the rosette or jaw-adj usting screw) areclamped or held in place 011 the shank of the wrench by means of acylindrical nut which is screwed into the ferrules.

The improvement relates to the construc tion and combination of parts,as hereinafter described, whereby the ferrule and shank of the wrenchare mutually strengthened, and the ferrule-clamping nut made readilyaccessible for being adjusted.

As will be observed by the drawing, the ferrule B is cast so that at thefront where it supports the rosette-screw I it has an oblong opening,allowing it to pass over the bar A, up against the shoulder K, and at ornear the back end. it has a round barrel cast so as to fit closelyaround the shank G, where it is supported by the cylindrical nut E,which prevents it from being forced back into the wood handle F. Arearwardly projecting flange, a, is formed on the ferrule B,concentrically with the cylindrical portion thereof, thus leaving anannular cavity or recess for reception of the end of the wooden handleF. This construction strengthens the ferrule and provides a support forit independently of the portions in contact with shank O. The shank 0being turned so as to fit the barrel D perfectly, the barrel D forms aback support, so that it will be impossible to force the ferrule B overin an oblique position in such a manner as to bend the rosette-screw I,as it is the case when the ferrule is supported by a nut or a taperingcollar inside, the supportingnut E being on the shank 0, outside or backof the ferrule, so that should it become loose, as is the caseoccasionally with supportingnuts, it can easily be got at to tighten itin a commonvise or with pipetongs, after taking oif the handle; but whenit is inside of the ferrule a special tool has to be made to do it,costing about as much as a new wrench.

Occasionally it becomes necessary to take the wrench apart, should thebar A get sprung by an unusual strain, or should the working parts getfilled up with oil and dirt; in either case it can be readily done whenthe supporting-nut E is outside of the ferrule.

What I claim as my improvement is- In a wrench, the combination, withthe shank O, of the socket B, having the oval and cylindrical portionsfitting corresponding parts of said shank, the outer flange to embracingthe end of the handle, and the inner flange extending beyond the outerflange, and bearing upon the nut E, all combined as shown and described,for the purpose specified.

MATTHEW E. OAMPFIELD. Witnesses:

J. H. NIcHoLs, GEO. P. REED.

FICE.

